fix: Remove deprecated http.CloseNotifier and replace with

[JiwaniZakir]

Fixes #4586

Removes the deprecated http.CloseNotifier interface from ResponseWriter in response_writer.go, which was removed from Go's standard library and caused compilation warnings. The Stream function in context.go relied on w.CloseNotify() to detect client disconnection, which no longer works with modern Go. Replaces the call with c.Request.Context().Done(), the idiomatic Go approach for detecting request cancellation. Verified by updating response_writer_test.go to remove the now-invalid interface assertions and panic test.

[JiwaniZakir]

Closing this PR as it hasn't received maintainer review. Happy to resubmit if there's interest.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (3dc1cd6) to head (250c29c).
⚠️ Report is 275 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #4588       +/-   ##
==========================================
- Coverage   99.21%       0   -99.22%     
==========================================
  Files          42       0       -42     
  Lines        3182       0     -3182     
==========================================
- Hits         3157       0     -3157     
+ Misses         17       0       -17     
+ Partials        8       0        -8     

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go-1.19	?
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